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Title: Large-area borophene sheets on sacrificial Cu(111) films promoted by recrystallization from subsurface boron

Abstract

Borophene, an atomically thin covalently bonded boron sheet, has attracted great attention as a novel quantum material because of its structural tunability and potential utilization in flexible and transparent electronics. So far, borophene has been synthesized on silver or copper single crystals, but these substrates are small, very expensive, and unsuitable for study of transport properties or electronics applications. Here, we report synthesis of borophene on nanometer-scale thick Cu(111) films grown on sapphire. We have developed a process of enlarging faceted borophene islands, by repeated submersion of boron into copper at high temperature and resurfacing and re-crystallization at lower temperature. This discovery was enabled by real-time feedback from low-energy electron microscopy and diffraction. We demonstrate synthesis of borophene as faceted micrometer-size monocrystal islands or as full-monolayer sheets. The process is scalable to wafer size; moreover, Cu films could be sacrificed and sapphire reused. Our work opens the door for new experiments and brings applications one step closer.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]
  1. Yale Univ., New Haven, CT (United States); Yale Univ., West Haven, CT (United States)
  2. Yale Univ., New Haven, CT (United States); Yale Univ., West Haven, CT (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1566875
Report Number(s):
BNL-212120-2019-JAAM
Journal ID: ISSN 2397-4648; TRN: US2001010
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
npj Quantum Materials
Additional Journal Information:
Journal Volume: 4; Journal Issue: 1; Journal ID: ISSN 2397-4648
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Wu, Rongting, Gozar, Adrian, and Božović, Ivan. Large-area borophene sheets on sacrificial Cu(111) films promoted by recrystallization from subsurface boron. United States: N. p., 2019. Web. doi:10.1038/s41535-019-0181-0.
Wu, Rongting, Gozar, Adrian, & Božović, Ivan. Large-area borophene sheets on sacrificial Cu(111) films promoted by recrystallization from subsurface boron. United States. doi:10.1038/s41535-019-0181-0.
Wu, Rongting, Gozar, Adrian, and Božović, Ivan. Fri . "Large-area borophene sheets on sacrificial Cu(111) films promoted by recrystallization from subsurface boron". United States. doi:10.1038/s41535-019-0181-0. https://www.osti.gov/servlets/purl/1566875.
@article{osti_1566875,
title = {Large-area borophene sheets on sacrificial Cu(111) films promoted by recrystallization from subsurface boron},
author = {Wu, Rongting and Gozar, Adrian and Božović, Ivan},
abstractNote = {Borophene, an atomically thin covalently bonded boron sheet, has attracted great attention as a novel quantum material because of its structural tunability and potential utilization in flexible and transparent electronics. So far, borophene has been synthesized on silver or copper single crystals, but these substrates are small, very expensive, and unsuitable for study of transport properties or electronics applications. Here, we report synthesis of borophene on nanometer-scale thick Cu(111) films grown on sapphire. We have developed a process of enlarging faceted borophene islands, by repeated submersion of boron into copper at high temperature and resurfacing and re-crystallization at lower temperature. This discovery was enabled by real-time feedback from low-energy electron microscopy and diffraction. We demonstrate synthesis of borophene as faceted micrometer-size monocrystal islands or as full-monolayer sheets. The process is scalable to wafer size; moreover, Cu films could be sacrificed and sapphire reused. Our work opens the door for new experiments and brings applications one step closer.},
doi = {10.1038/s41535-019-0181-0},
journal = {npj Quantum Materials},
number = 1,
volume = 4,
place = {United States},
year = {2019},
month = {8}
}

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